<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <!-- <ul class="cart-list" v-for="(cart,index) in cartInfoList" :key="cart.id"> -->
        <ul class="cart-list" v-for="(cart,index) in cartInfoList" :key="index">

          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cart.isChecked" @click="updateOneCheck(cart)">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg"> {{cart.skuName}}</div>
          </li>

          <li class="cart-list-con4">
            <span class="price">{{cart.skuPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins"    @click="changeCartNum(cart, -1, true)">-</a>
            <input autocomplete="off" type="text" :value="cart.skuNum" minnum="1" class="itxt"
             @change="changeCartNum(cart, $event.target.value * 1, false)">
            <a href="javascript:void(0)" class="plus"    @click="changeCartNum(cart, 1, true)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{cart.skuNum*cart.skuPrice}}</span>
          </li>
          <li class="cart-list-con7">
          <a href="javascript:;" class="sindelet" @click="deleteOne(cart)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul> 
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" v-model="isCheckAll">
        <span>全选</span>
      </div>
      <div class="option">
       <a href="javascript:;" @click="deleteAll">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{checkedNum}}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{allMoney}}</i>
        </div>
        <div class="sumbtn">
          <router-link to="/trade" class="sum-btn" >结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters, mapState } from "vuex";

  export default {
    name: 'ShopCart',
    mounted(){
      this.getshopCarList()
    },
    methods:{
      getshopCarList(){
        this.$store.dispatch('getshopCarInfo')
    },
   //修改购物车商品数量
    async changeCartNum(cart, disNum, flag) {
      //disNum 如果是点击的加号和减号，我们传递过来的是1和-1 是变化的量
      //disNum 如果是输入框change传过来的，那么这个disNum是最终的量
      // flag是用于判断用户是点击+-进来的还是输入框失去焦点进来的
      //获取原来本身的数量
      let originNum = cart.skuNum;
      if (flag) {
        //证明是点击+ -进来的  那么我们得保证最终的总数必须至少是1
        if (originNum + disNum < 1) {
          //证明原本的数量变化之后，比1还小，那么我们应该修正disNum
          //如果最终比1还小，那么disNum就应该修正，修正的结果让他们最终刚好是1
          // （原来为1）1+（-1）=0
          // 变化量为0，结果还未1
          disNum = 1 - originNum;
          this.$message.success('数量不能小于0');
          return
        }
      } else {
        //证明这个里面传递是input输入的值，disNum它代表最终的值
        if (disNum < 1) {
          //disNum此时代表的是最终的值
          // 原来是10，，输入的sisNum-7.originNum为-7，然后1-（-7）即变化量为8，-7+8结果为1
          this.$message.success('输入的数量不能小于0');
          disNum = 1 - originNum; //disNum代表的是变化的量
          return;
        } else {
          // 原来为3，输入8，然后8-8，变化为0，返回还为8
          disNum = disNum - originNum; //等号左边的disNum代表的是变化的量，等号右边的disNum代表是最终的
        }
      }
      //经历了上面的if-else  到这里disNum肯定是变化的量，不管是点击+-还是输入框输入，都是正确的变化的量
      // 发请求修改数量
      try {
        await this.$store.dispatch("addOrUpdateShopCart", {
          skuId: cart.skuId,
          skuNum: disNum,
        }); //disNum刚计算出来的变化的量
        // 如果请求成功重新获取购物车列表数据
        // alert("修改成功");
        this.$message.success('修改成功');
        this.getshopCarList();
      } catch (error) {
        this.$message.error(error.message);
      }
    },
   //修改购物车选中状态
  async updateOneCheck(cart){
    try{
      await this.$store.dispatch("updateCartIscheck",
      {
        skuId:cart.skuId,       
        isChecked:cart.isChecked?0:1
      });
      this.$message.success("已成功更改选中状态")
        this.getshopCarList()

     
    } catch(error){
     this.$message.error(error.message)
      }
  },
    //删除单个的购物车数据
    async deleteOne(cart){
      try {
        await this.$store.dispatch('deleteShopCart',cart.skuId)
        this.$message.success('删除成功')
        this.getshopCarList()
      } catch (error) {
         this.$message.error('删除失败'+error.message)
      }
    },
    //删除多个购物车数据
    async deleteAll(){
      try {
        await this.$store.dispatch('deleteShopCartAll')
         this.$message.success('删除多个成功')
        this.getshopCarList()
      } catch (error) {
         this.$message.error('删除多个失败'+ error.message)
      }
    }
  
  
  
  },
    
  
  
  
  
  

    computed: {
    ...mapGetters(['cartInfo']),

    cartInfoList() {
      // 从购物车列表对象当中拿到购物车列表
      return this.cartInfo.cartInfoList || [];
    },
    //统计已选的件数
    checkedNum(){
      return this.cartInfoList.reduce((prev,item)=>{
        if(item.isChecked){
          prev+=item.skuNum
        }
        return prev
      },0)
    },
    //统计总价
       allMoney(){
      return this.cartInfoList.reduce((prev,item)=>{
        if(item.isChecked){
          prev+=item.skuNum*item.skuPrice
        }
        return prev
      },0)
    },
    //计算是否全选
    //计算全选数据
    isCheckAll: {
      get() {
        //读取的
        return this.cartInfoList.every((item) => item.isChecked);
      },
      async set(val) {
        // val 获取到的是用户点击全选之后，多选框的checked属性值，它是个布尔值
        //写的  修改
        //再这里我们发请求，修改所有的购物车的选中状态
        //this.$store.dispatch('updateCartIscheckAll',val?1:0) 就是Promise.all返回的新的promise
        try {
          const result = await this.$store.dispatch('updateCartIscheckAll',val?1:0)
          // console.log(result)  ['ok','ok','ok','ok']
         this.$message.success('修改成功')
          this.getshopCarList()
        } catch (error) {
         this.$message.error('修改失败'+ error.message)
        }
      },
    },
    } ,
  }
  
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 15%;
          }

          .cart-list-con2 {
            width: 35%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }

     

          .cart-list-con4 {
            width: 10%;

          }

          .cart-list-con5 {
            width: 17%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 10%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 13%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>